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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c9b613d0c78372c75e44627df6e890dc8ee87cf414cbe78729e9130bb32782' 
  AND token = 'pLyxJuDn6mPoynZ0HrHSmtU03YTwmjnUW/bCNi17P68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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