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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b020f210f43128ed2232e44bd2a7e0abf697be2a0bc5cfbde875878c926dae09' 
  AND token = 'ydPWNWbgy6xqldg/olwTgiIT2FF/Y9yRD1W+5zgBb9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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