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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be097e284025f5e91f75e2edb454cf8a4ff6378502b6bb3b09f1f9a2c63438f0' 
  AND token = 'MjO8m4EcqU39a4g9kx2z1dsGRaisc+ps+8cCrH7ztNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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