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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2990c43951f5a56f822a251d188c275f710ed1ec3f655237c0d7f0e2c213e782' 
  AND token = 'Hkb/PG71Ve71Ni873EQnQ6XDDiporRQgo/d0NjMenng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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