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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6668feccfa2b472e1e8a5a0fe8b7a13e6c7d19dd7e65926f6ede5ecefd2d4e' 
  AND token = 'MlfUF35e6YD/JZ8rrGoGdMImBH2uhTIG8KHIRVceq58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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