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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849cd5d75c598e3fb8f9aadd08489e5186e68cecea91d159937362dd6420580d' 
  AND token = 'jn7n0r0Do7UV6K43ztWCyC4c0u6ZVzKRqY7RRKLARdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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