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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315321659472233a77148fd014370624bc840f08c077809a9a040ee5fb7088ad' 
  AND token = 'R8zcIi6qX83is0+uF58YPiHPGcEm6J5d2DEpVGV9KfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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