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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9788fdc5b3d32ea098faaff0ec4ced5dd9baa36baa748e2c74788c5ecaa582' 
  AND token = 'LI9o0whG+6lQmpInR2bo0/R5Pq60Az7HU3ufWko9te8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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