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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af48f375c584b2bc8c875c9a8f20df8d217f7a02bedcd549531840c6dbed0aa7' 
  AND token = 'p+2+kVe/xtr87yB7cNANjs1TtIe/sFksvaT76CL8Vgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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