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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce02ec18ed371f8c50edbfe883dc88e8e6cd1fdc53c113c3950e97b592ec6549' 
  AND token = '5C9sOsEy2qGFHsQJzL6qoG5Qb4bjEd2z3R3npNnEk6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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