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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1c06e475dade2b9d85e4c62cd140e6f4632b78cb13278781f2a3af5fd2d685' 
  AND token = 'v7hyZjaab198enfCU7DNnI7CLx3JGigermRsF4nGzf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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