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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6c556cbb71d2b2f763f6820b0329940227c182cee6413ee9c37750eff782c7' 
  AND token = 'hybhX2vZL2vclHz0K+sHwotr74XdQWGmNEuTAolKjG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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