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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4683217d8618f812be8582a79360b421a26e37f0d11832162ce304afd9c3e6dd' 
  AND token = 'II2Oun6sLay8LPw4veKAP+N1LijERmo4FGJgti8Abx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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