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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9eb299c6009e0cb950fae777f958b807fea4e8d11c20a2c2918a61f5ed6d2f' 
  AND token = 'V3n2g1+iGWoc4ZS4dy8qK5ORWTOxNqIzQiKLr3CfJa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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