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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7cde57d898440d410389ebb61ba8784bf3f70b09b955f728a7bdb646457ced' 
  AND token = 'cd3LrrqLDdYSSow3Q0jIAuj9FuBn0/71NFPQhn+0qic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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