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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ebfb55f86cb0d6fcf881c8f8110802134fd5182aabc6345ae5de8ff7a16597' 
  AND token = '0WT2ykZaABpOJMxHPXZipRCJP2gkDmpaVKdhUNp4NC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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