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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1dc28377ac11ad3093a80e427f4353d6fa88c44ae52f8f2e067441a5a0bb0c8' 
  AND token = 'tWJFE6GOPbCl8sg8VHOF6aKm5kAx0Ehxz1y4W1MQ6bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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