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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f1d26902c1691290ca456184c21797f93669715f8b7720d918072dd31c2ca4' 
  AND token = 'B/Y9KQM/9HYToO35VdEcEaF0B9JNP17pzyWUat+uau4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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