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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710f4bf9936a6fb69d03030210c1a18cc698fb4c2f40d078d9d519e3bbe19551' 
  AND token = 'rg587lhJOCJKwEQ9Kw9TVoJ9zVnwrJsSnr41WbM/1BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}