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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f86ab83ae7286733f03bedfd9e20f11a2db2c1e12387c391c579e4250664aff' 
  AND token = 'ex7EmmFraUUQ2MUHbS2sY/h5p/QNU+1Fc6aCk/+AEX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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