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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f34af37196bcd88e6c08eaf2a0d3aa9b4f4d8b3ee31371ab9d5d8b593844572' 
  AND token = 'S6x6jjBYWlU9bHqs13Rx3K00oaDIt7IgCITHSz8VnfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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