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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1ef779a4109f64fe5c8ef7f923ace51e6b140cf9237efcc3bec9bd4dd25e02' 
  AND token = 'Fpj/8c3R8XyEwu258JQnm8k8R7yWQYu2vBN+fgpRzo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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