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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c452f39c35b907e5c99beac622c200c3f277d8d69924f2afb80733ee2108b3' 
  AND token = 'rp7DSRXkdVeGx5K+rZOmaYaa+niSP82ufmOU57Fay/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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