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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc48e323c23d64150173c0692d4c02ea90de106fde44c3ffb414fad098aa7791' 
  AND token = 'gE/tkUqLE2qERZrvSF87cYaul3uNLinbOw3e2bnLDUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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