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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1ce8e9b69a9311d2eb5f06b2f6ddc836f5a405138ad92299615523fcc5033f' 
  AND token = 'r3Jig7bBfYXtM7Ez/w5IFe2IXu+I+flZTpikex9QvkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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