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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfaffd26ea3ff7ccf76f7a4b8d914c73e71df25d6ae947f9be06183490342b0' 
  AND token = 'MBmBfF/tHS6SZHGQ2Bq2GkUreak1Y60+m2CFbEpVIQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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