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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebccd166f98af3fffb4908577efe7632bf3e3bcaca5ef40aa9170933195db748' 
  AND token = 'Q+b0f64GjKy9zauZg8dBUNPFqcMcuOzyJGvOddm4wZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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