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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd34a97c6ea52719101c78a3d914db4eb660ddaf7a69711b709854c01f547923' 
  AND token = 'qOPYQZhVvP0Sd14E8nygZC4gYR/Me3MeaFHo+wtc8EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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