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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8708b5399cb57b5e5082d179238db1a327d20771b2be6cbbb98aab91f36af8' 
  AND token = 'suSL+6ik79FTma8HdQkPBXgheWt5IgDa8J4bhryl/cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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