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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5f41a4bab0e78505000c260c8f29a276bd3daee58fdc7f0010359f593fd96a' 
  AND token = 'yn/TyXX8JBlDcw5ADYWYTM6xAa8l+Sl9gWaGdwTUmeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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