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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4ac32793a85b1104ab8f47128eb9ced10cbe5085a4b9af6cd740bcac99e784' 
  AND token = 'buoiurR3rA8aQeZia9BvziMpMOfQOoOtRNrBfmmY70s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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