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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61054a7a87fe954f0a9fd6ad62c2e7d5f85519705e5c8abfae703e2333933529' 
  AND token = 'CjzY23AsObtXyjT/JYcthzgUqyqPk8FdVx3Y/lbnAl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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