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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97dc6fe65331cb8ee557abefc13c494e1b34fc56bda4817af776f735681b84a' 
  AND token = 'e3Z/WET6eK1uA44aC5h6io0mCb7wsThApsv7Nbd76lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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