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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2525606b5dcd79f0562325534a586e1b5ab52a782524b5b5ed7885d86a6f9d' 
  AND token = 'YyYi4shq6etrml251igRvvedfmtiUEDeKt60dwAompY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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