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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2406e7e4ef631042337190fcef8c2c848d58228be1572097f9311defa73b2b9f' 
  AND token = 'Z/l+syHzEs9rGqmvC8nIsD1oFbDRCVFmtjV0CANLUdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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