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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca6979ff43012c74a51b12908f49c85739f8c81599b13d51ed9e670f2b845d9' 
  AND token = 'CbblSuFd/OYn4eRWhE3T01rO9GqQ1hK71/TvdG8z2c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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