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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560c2bd36f9b3c335549966182c53f4c938a529ac6323b23225bb3e8d6f0116e' 
  AND token = 'cnBFPYIpRJpXicog0aoTxE2/Gq2d4A/nqQY19J8cikE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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