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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84197754d617f0b6d0a243dc7788061c48773edc9b4ff09a85462e648cd3c761' 
  AND token = '23I8zqphxZIkG1yoeF0dPObJyzjcgo19q/84vYRSFBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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