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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee9387cf366a08937e260dabe1664a249ef67d5c5d3feb1ab999f9b8cfdc4e8' 
  AND token = '23vOq85rEvRdWo3nRtBXJHssSA5lvhrYScN4oP8Ftf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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