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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f59a279fac695d00555d64839351f7793b2993bd65334e19ba754622939dff' 
  AND token = 'gZsVS9cY2IFYodByTkWADW9KJs00gOQA6Aeszy5VUbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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