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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb9d810f9b73d33827d5ed3a424ae0fd40168a3a0e7241d99d4be96ddc70a9d' 
  AND token = 'cCkiWYHLNbdAJ5vPKNm67jH4ghC+cesdRRiolpP3LAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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