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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d76dd5876526272a1bf035cb487f9653de7655e1ab67f5b1da42ff60b222192' 
  AND token = 'e9peJrS3YHQR5fi4gsRtMUDQDCJcgEIk6ZYzj+X3g7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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