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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fce2b50e2a17a33f6c86ce7c831bf630c3725f70d4cab45c08a63a2b60941c' 
  AND token = '4nO66pqcN9+tUENrGIehFZptKJgmmxhyjFP+FO7s6Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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