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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d6400fe118a1299efe1e7cfb195a4fa3703fa0d2575f5b9ea0a632ff85d879' 
  AND token = 'xE5qrXoKFM2+dxvf2VcISKhFZNhUJ/o2bS9uCxiFtAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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