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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d9c503575e01c1abb2b62f5596f3aa6c73a8c3f59aa3230c87a14078737862' 
  AND token = 'vvRNFpaBaAh7/Ck16tm00DJ83VIKrtf8txfySTWVWQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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