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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfccc74960e0fb77404df2bdf180c9f3ee16497ac9c7efcbf4980ef711f6a49' 
  AND token = 'xyM5hpc7h4vizCeyVtpyBgm8PAFC+3cSuRbnv7/SeRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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