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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982ee054f3789de50f4d3f2122619c9d53cf641d16691af1a40d1454b4c34a8f' 
  AND token = '8I4za6A1AvkH2b94BOjMJVTS2R2bBBfqGZDQrO1wakg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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