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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f4a2308a5625fd604e57573097421a779c537ae373838f6c3185df87d701b4' 
  AND token = '+GPwZmGtPg6aRY3nXvXlgkVUI90CUBQMCoG7upe0afU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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