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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1750249be25c276e0e9985addc7099a331f9474b4f74b723d21e83b02d9da9' 
  AND token = 'pqecipINDn0RsW17EF0PncGb/cLGI5CeV/JcyrS3vQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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