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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ebfca1daa2ed704aff02c0827a7104ebb8058a2ed42ae2b9449d3f4e1b622e6' 
  AND token = 'iAdhjqSSKnz1ZZ4FUTjjsv+e6Rj11px3/4WqUhg22Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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