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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a338f57103197723b3600fe1ab13314eb3952818ee7312efd15053232c3fbc35' 
  AND token = 'hyf4613mYgDTzG2z7pM1+j5OWOe8yhF1s+Z5nx8V9zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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