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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088e55d35492637fb9dc8c2442fce74089e2858d024ca7bd597d72361a1ec009' 
  AND token = '2azvMYO8QAiveLIHoC9DKPpm76+mFfxGgE4S6yq9Aao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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