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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c38236f8ab79c513a7c216d4c0ad0ee73c232fe5bded69e37b8438ffba4afa' 
  AND token = 'RsvfURHVpQk07Bi1ZUHiY3IMjeX33/0SqkTAfnrENIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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