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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fbdeeb64611584d76b0e178e3aab0d22d6189922c678d6ca3cb77d17a46156' 
  AND token = '4bbQM1p4ZW9pElS1P5xYEfytk8x3ifQdkEDIrt6/y58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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