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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce69cacb1d231b33bfa5e94a4d722402cf388622dd951c8fb345f2bcf4a2f79a' 
  AND token = '5Z1CfKou1Uk5i3QfxZo43XSYnZuExweRO0v0jMzxlyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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