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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02fcc1f04d381864ac91338965fb0abf7203c2bf7c417893a8d163e3aad758e' 
  AND token = '8ZZK54HTH2o1tp+XeltXnTonurvjfaT1WvJqTrbhTq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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