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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f69d49034644c47aadc46418e61fb2f5f50c2c79704769c44e75c2c8c457fb2' 
  AND token = 'gMbW0fh95SAJ+2XnKOQbtZalJU9E7oOOjZimqvRJ5Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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