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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67a9ffa574d9f1246d938dcae73ac0f5a9e2cbc40aa5e75ae379f7f97ef1059' 
  AND token = 'djciO6UvfAT1UCvD9QcJRDs3ygOmX+TcLCcXOdT8Q34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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