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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9e10d82ec6082f8be7a88350b4aab8b72d0fb2f3b5979b0918aac342deae40' 
  AND token = 'ebBa1THRLslnmWu5zC7Ftf4sgQbHLziBrrDCiOfAPtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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