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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc209391b708c7c30ecbca9cc7d84437146af42de949b79abeb034d31754f8f1' 
  AND token = 'SUOmlJdtGwR+FeFdH6pTO9cvqerOdFUf7jdBKxmer50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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